Doryman Shellfish Calipers may also be set from 3 to 6 1/2 inches to measure lobsters and crabs to specific legal sizes. Even as they drift, these calipers also employ an attached lanyard to steer clear of any dropping mistakes. When the caliper is fully extended it becomes a 9 inch straight edge rule. When collapsed it could actually easily fit into a pocket. A very simple twist knob regulates the calipers size and can be utilized to lock in measurements. These calipers have four color options: Blue, Green, Red, and Yellow.
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Measure the legal fishing sizes of lobsters and crabs, 3 to 6.5 inches
Extends to a 9 inch long straight edge rule, collapses to slot in a pocket
Made of expanded PVC, which allows the tool to drift
Handy lanyard provided to assist do away with accidental drops
Easy twist knob can lock a measurement in place
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